John. M. Rassias, M. Arunkumar, and S. Karthikeyan. “Stability of a Quadratic Functional Equation Originating From Sum of the Medians of a Triangle in Fuzzy Ternary Banach Algebras: Direct and Fixed Point Methods”. International Journal of Mathematics And Its Applications, vol. 3, no. 4 - A, Dec. 2015, pp. 45-64, http://ijmaa.in/index.php/ijmaa/article/view/485.